P={1,2,3,4}, Q={u,v,w,x,y},How many functions from P to Q are neither one to one nor map 3 to y

Question

P={1,2,3,4},  Q={u,v,w,x,y},How many functions from P to Q are neither one to one nor map 3 to y？

OYHM · Answer

这是GRE？不是单对单……1 2 3 4都有4+3+2+1个，总共40个，减去3对y的4个……答案是36个